US Bridges

Lambert Bridge RD over Dry Creek

Fair

Sonoma County, California · 0.4 MI W of Dry Creek RD · Structure no. 20C0248

Built
1915
110 years old
Condition
Fair
inspected July 2023
Type
Truss - Thru
Steel
Length
188 ft
1 main span
Daily traffic
838
2008 count
Owner
County
County Highway Agency

About this bridge

Lambert Bridge RD over Dry Creek is a steel truss - thru carrying Lambert Bridge RD over Dry Creek in Sonoma County, California. It was built in 1915, so it is 110 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 838 vehicles a day, roughly 1% of them trucks, projected to reach 1,301 by 2043. The structure is 188 ft (57.4 m) long and 17 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

Open in Google Maps
CarriesLambert Bridge RD
CrossesDry Creek
Location0.4 MI W of Dry Creek RD
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.65402, -122.9277
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating33.6 US tons
Inventory rating20 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length188 ft (57.4 m)
Longest span185 ft (56.5 m)
Deck width17 ft (5.2 m)
Roadway width16 ft (5 m)
Vertical clearance over deck13 ft (4 m)

Traffic and service

Average daily traffic838 (2008)
Projected traffic1,301 by 2043
Trucks1%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Lambert Bridge RD over Dry Creek built?

It was built in 1915, making it 110 years old in 2025.

What condition is Lambert Bridge RD over Dry Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in July 2023.

How much traffic does Lambert Bridge RD over Dry Creek carry?

About 838 vehicles per day (2008 count), of which roughly 1% are trucks.

How long is Lambert Bridge RD over Dry Creek?

The structure is 188 ft (57.4 m) long with a longest span of 185 ft (56.5 m) and a deck 17 ft wide.

Who owns Lambert Bridge RD over Dry Creek?

It is owned by the County Highway Agency.